CIDR Calculator

Calculate IP ranges and subnets

CIDR Notation

Enter a valid CIDR string to see the network metrics.

IP / CIDR Calculator Online

How to use CIDR Calculator

Type a valid IPv4 CIDR notation (e.g. 192.168.1.0/24) into the input field.
View the calculated Network Address, Broadcast Address, Wildcard Mask, and Host Range.

Edge Cases & Limitations

Only IPv4 addresses are currently supported.
/31 and /32 prefixes are handled according to special point-to-point and host route rules.

Keyboard Shortcuts

Ctrl/Cmd + K — Open Command Palette to switch tools instantly.

100% Client-Side Privacy

All inputs are processed entirely inside your browser's memory using JavaScript. No data is ever transmitted to any server. Your tokens, JSON payloads, cURL commands, and timestamps never leave your machine.